usarts-recv.c File Reference

generic USART access implementation - receive More...

#include "config.h"
#include "usarts.h"
#include "rtc.h"
#include "usarts_int.h"
#include "usarts_all.h"

Defines
#define	USART_DEF   USART_DEF_RXINT
Functions
usart_rxdata_t	usart_recv (usart_control_t *uc)
	get one byte from USART (blocking)

---

Detailed Description

generic USART access implementation - receive

---

Function Documentation

usart_rxdata_t usart_recv

(

usart_control_t *

uc

)

get one byte from USART (blocking)

This function reads one byte from the USART RX FIFO. When the FIFO is empty, it blocks until data has been received.

Parameters:

uc

pointer to USART control structure

Returns:

byte read from USART

{
  fifo_item_t it;
#if 0 /* duplicated in fifo_get_uint8_t() */
  while (!usart_can_recv (uc))
    hl_sleep_for_tick (0);
#endif
  if (fifo_get_buffer (&uc->rxbuf)) {
    it = fifo_get_item (&uc->rxbuf);
    return (usart_rxdata_t) {.data = it.data, .flags = it.flags };
  }
  else
    return (usart_rxdata_t) {.data = 0, .flags = USART_NO_RX};
}